Collapsible core-barrel



(No Model.)

B. G. GOPPIN.

UOLLAPSIBLE GORE BARREL. No. 369,317. Patented Sept. 6, 1887.

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llNrrEn STATES Pnrnnr @rrrcn I DANIEL e. oorrnv, or NEWPORT, KENTUCKY- COLLAPSIBLE CORE-BARREL.

SPECIFICATION forming part of Letters Patent No. 369,317, dated September 6, 1887.

Application filed June 23, 1887.

To (tZZ whom it may concern.-

Be it known that I, DANIEL G. COPPIN, a citizen of the United States, residing at N ewport, in the county of Campbell, State of Kentucky, have invented certain new and useful Improvements in Collapsible Gore-Barrels, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to those metallic corebarrels which are capable of being readily collapsed, so as to facilitate their removal from the pipes or other castings formed around them; and the first part of my improvements consists in means for effecting such a contraction by shifting the barrel longitudinally of the core-bar, thereby obtaining a decided advantage over the old-fashioned devices, as hereinafter more fully described.

The second part of my improvements com-' prises a novel combination of devices, whereby this shifting of the barrel longitudinally of the corc-bar is readily accomplished by the molder, as hereinafter more fully described.

The third part of myimprovements consists in such a construction of the barrel as will cause the clay or loamcoating to be readily sheared or cut off in the act of collapsing said barrel, as hereinafter more fully described.

In the annexed drawings, Figure l is a side elevation of the preferred form of my collaps ible core-barrel in its normal or expanded position, the clay or loam covering around the same being indicated by dotted lines. Fig. 2 is an enlarged axial section of said barrel in its contracted or collapsed condition, the central portion of the barrel and core-bar being broken away. Fig. 3 is a plan of a modified form of the upper head of the barrel, the adjuster and core'bar being sectioned. Fig. at is an enlarged transverse section of the expanded barrel, taken at the line 4 4. of Fig. 1. Fig. 5 is an axial section of a modification of the invention.

The supporting member of my core-barrel is a rigid tube or core-bar, A, to whose lower end is attached a head, B, having a chamber, 2), and an inwardly-sloping annular rim, 2), for a purpose that will presently appear. Securely fastened to this bar, and near the upper end thereof, is a collar, 0, upon which rests a screw-threaded adjuster, D, having a hand- Serlal No. 242,229. (No model.)

wheel or other portion, (Z, wherewith it is readily turned, as occasion requires.

E is another collar secured to the core-bar A in any suitable manner, the adjuster D being free to turn between these collars G E, but incapable of longitudinal shifting upon said bar. The screw of adjuster D engages with a nut or female thread, f, of the upper head may be solid, as seen in Fig. 2, although it is preferred to furnish said head with openings f, as represented in Fig. 8, to facilitate the escape of gas and other vapors from the interior of the barrel, the body of the latter being cylindrical when in its normal or uncontracted condition, and being composed of metal or any suitable composition of metals.

In order to render this barrel collapsible, it is slotted longitudinally from near the headF down to its extreme lower end, the exact number and size of said slots being immaterial. As seen in Figs. 1 and 4, six of these slots 1 are represented, while .Figs. 2 and 5 indicate that a pairof diametricallyopposite siots, g, may be employed, if desired. Furthermore, Fig.4 shows that the slots are wider at the rear than in front, thereby aiiording sharp edges to the segments G, which edges sever the clay coating at the proper movement.

Each segment or section G of the barrel is pierced with small openings H, of any size and shape that will afford a secure anchorage for the customary clay or loam covering, the latter being indicated by the dotted lines I in Fig. 1. Again, each segment of the barrel or shell has near its lower end an internal inclined projection, J ,which projection at the proper moment impinges against the beveled periphery of a wheel, disk, or spider, K, said device K being fixed to the corc-bar A. The extreme lower end oleach segment has a chamfered bearing, L, adapted to slide against the inclined annular rim Z) of the lower head, 13, said segments being grooved above these bearings, as at Z, to reduce friction. This preferred form of my core'barrel is used in the following manner:

Preparatory to the application of the clay, loam, or other appropriate coating, I, the ad juster D dis so turned as to cause said barrel to ascend along the corebar A until the bottom of the annular grooves Z of the segments head, F, of the collapsible core-barrel G. This dried in the usual the inclined projections J are gradually being forced against the beveled periphery of'the fixed wheel K, which accordingly acts as an expander that distends the barrel and causes it to assume a true cylindrical form from end to end, said wheel serving also to prevent an accidental collapse of said barrel. (See Fig. 4.) The outer coating, I, is then applied to the barrel and turned down true and smooth in the manner well known to all molders, the

- clay anchoring both in the holes H and 1ongitudinal slots 9, the rearwardly-fiaring shape of these devices affording a secure hold for the covering material. The core is then baked or way and lowered into the pit, mold, or flask into which the metal is to be poured, it being understood that the apparatus is designed more especially for easting gas and water pipes, or other similar tubes. While the metal is being poured into the pit or flask the resultant gas or vapor escapes from ously forces the coating I through the holes H and slots 9 into the interior of the barrel, which latter has free ventage at the openings f (Seen in Fig. 3.) As soon as the metal has set or become cool, the adjuster D (Z is turned in a reverse direction for the purpose of causing the barrel to descend along the supporting bar or tube A, which act relieves the projections J from the pressure of the expander K, and simultanethe lower end of said barrel into the chamber 1) of head 13. As this portion of the barrel descends into said chamber, the chamfered bearings L of the various segments G are forced against the inclined rim 1; of said ,head, thereby gradually and uniformly contracting these segments from top to bottom, and causing said barrel to assume the tapering or conical form seen in Fig. 2; While the segments are thus being collapsed, the slots 9 are necessarily becoming narrower, and as they are brought together their sharp edges cut the clay loose from the barrel and allow the latter to be conveniently lifted out of the pit, flask, or mold. V

In the modification of my invention seen in Fig. 5 the lower head,.]3, has a series of upwardly-projecting expanders, B,one for each segment composing the barrel, the outer edges of said expanders being inclined at any suitable angle.

J and K are inverted fac-similes of the devices J K. (Seen in Fig. 2.) In this construction the barrel G is normally contracted or collapsed; but when said barrel is forced down along the core-bar A. the inclined expanders B coact with the devices J K in gradually pressing the segments outwardly, and thus bringing said barrel to the desired cylindrical form, as indicated by the dotted lines. The cylindrical barrel is then properly coated, the casting made, and said barrel is then caused to ascend the core-bar A and assume its normal or contracted condition,which act frees said barrel from the clay or other covering. From this description it is apparent that the devices seen in Figs. 2and 5 embody the same features-that is to say, a sup porting core bar or tube surrounded bya longitudinally-slotted barrel or shell that is expanded and contracted by shifting it along saidbar. Either of these devices will be found to possess decided advantages over those collapsible core barrels core-bars, as some casting pits and flasks are so made as to render it impossible to use these shiftable bars without removing the socketplate at the bottom of the pit every time a pipe is cast, thereby'involving a loss of time and causing a corresponding increase in the cost of manufacture. Finally, either of these core-barrels may be shifted by any convenient appliance or appliances, as the invention is not limited to the screw-threaded adjuster herein shown and described.

I claim as my invention- 1. A core bar or tube carrying a longitudinally-slotted barrel, means for advancing and retracting the barrel along said bar, and de vices for expanding and contracting said barrel, substantially as described.

2. The combination, in a collapsible core apparatus, of the supporting bar or tube A, head B b b, fixed collars O E, screw-threaded adjuster D, screw-threaded head Ff, longitudinally slotted core barrel G g, inwardly inclined projectionsJ, expander K, andchamfered bearings L,for the purpose described.

3. Acollapsible core-barrel whose segments G are separated by inwardly-flaring longitudinal slots g, for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

DANIEL G. COPPIN.

Witnesses:

JAMES H.- LAYMAN, SAML. S. CARPENTER.

operated by shiftable 

